Beardius mileneae, Pinho & Mendes & Andersen, 2013

Pinho, Luiz Carlos, Mendes, Humberto Fonseca & Andersen, Trond, 2013, Revision of Beardius Reiss et Sublette, 1985 (Diptera: Chironomidae), with the description of twenty new species, Zootaxa 3742 (1), pp. 1-78 : 47-49

Beardius mileneae sp. n.

( Figs 85–88 )

Type material. Holotype: male, BRAZIL, Santa Catarina State: Urubici, São Joaquim National Park, Morro da Igreja , Rio Pelotas , 1670 m a.s.l., S28°07'37" W49°28'47", 18.viii–05.xii.2004, Malaise trap, L.C. Pinho & L.E.M. Bizzo ( MZSP) . Paratypes: 27 males, as holotype ( MZSP, INPA, ZMBN, MZUFBA, ZSM) .

Diagnostic characters. The species belongs in the tupinamba group. The male can be separated from all other members of the genus by the combination of the following characters: coloration brown; R 1 with setae; superior volsella with microtrichia; and basal projection of inferior volsella attached to basal 2/3 of the volsella, not overreaching the volsella, with fringe of lamellae.

Etymology. Named after Dr. Milene Hoehr de Moraes, the senior author’s beloved wife.

Description

Male (n = 9–10, except when otherwise stated). Total length 3.08–3.49, 3.28 mm. Wing length 1.72–2.10, 1.93 mm. Total length / wing length 1.59–1.84, 1.72. Wing length / length of profemur 2.24–2.46, 2.35.

Coloration. Head and abdomen light brown. Thorax stramineous with scutum, vittae, postnotum and preepisternum light to dark brown. Legs light brown.

Head. AR 0.84–0.92, 0.88; ultimate flagellomere 421–477, 439 µm long. Temporal setae 11–13, 12; not well separated in inner and outer verticals and postorbitals. Clypeus with 9–13, 11 setae. Tentorium 99–157, 121 µm long; 25–33, 29 µm wide. Stipes 124–142, 134 µm long. Palpomere lengths (in µm): 33–38, 35; 33–48, 43; 119– 154, 139; 106–149, 124; 121–159, 139. Third palpomere with 2–4, 3 sensillae subapically, longest 13–20, 15 µm long.

Thorax. Scutal tubercle absent. Dorsocentrals 6–9, 7; acrostichals absent; prealars 2–3, 2. Scutellum with 4–8, 6 setae.

Wing ( Fig. 85 ). VR 1.32–1.59, 1.42. R with 8–14, 11 setae; R 1 with 5–9, 8 setae; R 4+5 with 2–27, 18 setae. Brachiolum with 2–3, 2 setae. Remaining veins bare.

Legs. Spur of fore tibia (including scale) 48–59, 54 µm long; spur of mid tibia (including comb) 64–86, 75 µm long; spur of hind tibia (including comb) 64–80, 75 µm long. Width at apex of fore tibia 48–59, 54 µm; of mid tibia 48–59, 54 µm; of hind tibia 59–70, 64 µm. Lengths and proportions of legs as in Table 15.

Hypopygium ( Figs 86–87 ). Anal point bluntly triangular, 3–8, 5 µm long, not reaching posterior margin of tergite IX. Tergite IX without setae, tergal bands weak to absent. Laterosternite IX with 2–4, 3 setae. Phallapodeme 56–68, 63 µm long. Transverse sternapodeme 43–66, 58 µm long. Gonocoxite 124–152, 137 µm long. Superior volsella digitiform, curved, 48–58, 53 µm long, with 7–10, 8 dorsal, 2 apical, and 2–3, 2 ventral setae, with microtrichia on both dorsal and ventral surfaces. Median volsella 3–5, 4 µm long, with 2–3, 2 apical setae, longest 23–28, 25 µm long. Inferior volsella clavate, 66–83, 73 µm long, with 2 apical thin and 5–7, 6 subapical stout bifid to trifid setae; projection arising from basal 2/3 of the volsella, with microtrichia and fringe of lamellae ( Fig. 88 ). Gonostylus 134–159, 142 µm long. HR 0.92–1.02, 0.96. HV 2.33–2.71, 2.50.

Female and immatures. Unknown.

Distribution. The species is collected in the Santa Catarina State in Brazil.

Figures

FIGURES 85–88. Beardius mileneae sp. n., male. 85—wing; 86—anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 87—hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect; 88—inferior volsella, lateral view.